Paramiko SSH Key-Based Authentication Example: Cisco IOS using Specific Signature Algorithm SHA-RSA

#sshkey #ssh-algorithm #paramikosshkey
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use specific private key file for ssh auth

import sys
import time
import traceback

import paramiko.util
from paramiko import client, ssh_exception, RSAKey
from getpass import getpass
import socket
paramiko.util.log_to_file("paramiko.log", level="DEBUG")

username = 'admin2'
csr_cmd = ['config t', 'int lo1001', 'ip address 1.1.1.1 255.255.255.0', 'end']
key_file = RSAKey.from_private_key_file(filename='/home/evolve/.ssh/id_rsa')
def cisco_cmd_executor(hostname, commands):
try:
print(f"Connecting to the device {hostname}..")
ssh_client = client.SSHClient()
ssh_client.set_missing_host_key_policy(client.AutoAddPolicy())
ssh_client.connect(hostname=hostname, port=22, username=username, look_for_keys=True,
allow_agent=True,
pkey=key_file,
disabled_algorithms=dict(pubkeys=['rsa-sha2-512', 'rsa-sha2-256']))

print(f"Connected to the device {hostname}")
device_access = ssh_client.invoke_shell()
device_access.send("terminal len 0\n")

for cmd in commands:
device_access.send(f"{cmd}\n")
time.sleep(1)
output = device_access.recv(65535)
print(output.decode(), end='')

device_access.send("show run int lo1001\n")
time.sleep(2)
output = device_access.recv(65535)
print(output.decode())
ssh_client.close()
except ssh_exception.NoValidConnectionsError:
print("SSH Port not reachable")
except socket.gaierror:
print("Check the hostname")
except ssh_exception.AuthenticationException:
print("Authentication failed, check credentials")

except:
print("Exception Occurred")
print(sys.exc_info())
# traceback.print_exception(*sys.exc_info())

cisco_cmd_executor('csr1.test.lab', csr_cmd)